Building and Daisy Chaining Rain Barrels
Anyone can build a rain barrel with an old food container and a few cheap plumbing parts from the hardware store. You can usually get the barrels cheaply, if not free, from local food distributors who ship things like olives and pickles, which require to be stored in liquid and are purchased in bulk. If you can’t find one or don’t want to make your own, you can buy one here for $130 plus shipping.
I have one here in Colorado, and would have more if we ever got enough rain to fill up the one I have. It’s dry here! But for those of you in wetter climates (lucky!) you may want to consider daisy chaining multiple rain barrels together so that if one overflows the water goes into the next one instead of being wasted out of the overflow valve. If you get plenty of water in the spring and your garden is a little ways away from the house, it might be a good idea to allow the water to fill up the first tank and begin moving itself down the line of subsequent tanks until it fills one sitting right beside your garden.
Here is a video that describes how to make one and how you might daisy chain them together from the overflow valves:
One person who has done a great job of this is Judy Alexander, as shown in this short video documentary by Peak Moment (at about 10:40 into the video):